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Why Am I Getting 'Predefined type 'System.ValueTuple' is not defined or imported' in C#?

Patricia Arquette
Patricia ArquetteOriginal
2025-01-03 02:14:39156browse

Why Am I Getting

ValueTuple Errors: Predefined Type Undefined

When working with tuples in C#, developers may encounter the error "Predefined type 'System.ValueTuple´2´ is not defined or imported". This error indicates that the ValueTuple type is not recognized by the compiler.

This issue arises because the ValueTuple type is only available in certain versions of the .NET Framework or .NET Core. For .NET 4.6.2 or lower, .NET Core 1.x, and .NET Standard 1.x, it is necessary to install the NuGet package System.ValueTuple.

To install this package using the NuGet Package Manager Console in Visual Studio:

  1. Type Install-Package "System.ValueTuple" and press Enter.

For projects targeting .NET Framework 4.7, .NET Core 2.0, or .NET Standard 2.0 and above, the ValueTuple type is included by default.

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